let validator = {
    set: function (obj, prop, value) {
        // debugger
      if (prop === "age") {
        if (!Number.isInteger(value)) {
          throw new TypeError("The age is not an integer");
        }
        if (value > 200) {
          throw new RangeError("The age seems invalid");
        }
      }
  
      // The default behavior to store the value
      obj[prop] = value;
  
      // 表示成功
      return true;
    },
  };
  
  let person = new Proxy({}, validator);
//   debugger;
  person.age = 100;
  
  console.log(person.age);
  // 100
  
  person.age = "young";
  // 抛出异常：Uncaught TypeError: The age is not an integer
  
  person.age = 300;
  // 抛出异常：Uncaught RangeError: The age seems invalid